Block Plant Laborer. Georgia Masonry Supply, a CRH company, is a division within Oldcastle APG. APG is North America’s leading manufacturer and supplier of concrete masonry, dry mix, and hardscape products. With over $2B in sales, APG operates across 36 states and 5 Canadian provinces through a network of over 195 operating locations and more than 6,500 employees. Job Description Summary. Read job specifications to determine machine adjustments a...